Rock-drill.



No. 696,087. Patanted Dec. 3l, I90I. G..D. WARREN.

BUCK DRILL.

(Application led Jan. 24, 1901fs (No Model.) s sheets--shem l.

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No. 690,087. Patented Dec. 3l, |9OI. G. D. WARREN.

ROCK DRILL.

(Application filed Jan. 24, 1901.) (No Model.) 3 Sheets-Sheet 2.

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@btob-Aw No. 699,@87. Patented Dec. 3l, |90I. s. n. WARREN. ROCK DRILL.

(Application Ilcd Jun. 24, 1901.)

(No Model.)

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NrTEo STATES PATENT OEEICE.

GOVERNOR D. VARREN, OF INDEPENDENCE, COLORADO, ASSIGNOR OF ONE-HALF TO CHARLES I-l. MCCORMICK AND SOLOMON I. LANCTO, OF

INDEPENDENCE, COLORADO.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 690,087, dated December 31, 1901.

Application filed January Z4, 1901. Serial No. 44,601. (No model.)

T @ZZ tlf/tom it may concern:

Be it known that I, GOVERNOR D. WAR- REN, a citizen of the United States, residing at Independence, in the county of Teller and State of Colorado, have invented new and usefullmprovements in Rock-D rills, of which the following is a specification.

My invention relates to improvements in rock-drills, and particularly to that class in 1o which steam or air is used as the motive power.

The object of my invention is to provide a drill in which the piston is rotated during the reciprocation thereof.

Another object of my invention is to provide a cheap, simple, and durable rock-drill which will fully accomplish the above result using any desired per cent. of expansion.

Another object of my invention is to prozo vide a rock-drill in which the valve-operating arm not only opens and closes the inlet-ports, but imparts the rotary motion to the piston during the reciprocation thereof.

A still further object of myinvention is to provide a reciprocating piston within a cylinder and carrying at each end detachable packing, which prevents the jarring of the machine which would otherwise occur.

In the accompanying drawings, Figure lis 3o a top plan view of my invention. Fig. 2 is a longitudinal sectional view taken on the line l l, Fig. l. Fig. 3 is a transverse sectional view taken on the line 2 2 of Fig. 2. Fig. 4 is an enlarged detached view of the valve and 3 5 the operating-arm in connection with the cylinder and the piston. Fig. 5 is an enlarged detached view of the valve-seat. Fig. 6 isa transverse sectional View taken on the line 3 3 of Fig. 2, showing the detachable pack- 4o ing carried by the piston-head. Fig. 7 is a vertical sectional view of the chuck on line '7 7, Fig. 2. Fig. 8 is a longitudinal sectional view of the valve g.

Referring now to the drawings, c represents a longitudinally-arranged cylinder, made of brass or any other desired material and resting upon the plate M and provided at its forward end with the head e and at the rear end with the head I-I. Resting upon the top of the cylinder is a plate R, which car- 5o ries the longitudinally-exfending inlet-ports y, leading to both ends of the cylinder and communicating with the openings y in each end of the cylinder, which are used ou one stroke as inlet-ports and on the other stroke as exhaust-ports in the manner well known in the art. The central part of said plate R has an enlarged thickened portion R, which has a concaved outer portion adapted to receive the Valve-seat A, which is approxi- 6o mately semicircular in shape to fit the concaved portion of the plate R. The said valveseat is provided with a horizontal transverse opening F, which has ports y2, extendinglongitudinally therefrom and registering with the port-s y of the plate.` The upper part of the valve-seat has at the top a transverse opening A, communicating with the valveopening F, through which the steam is admitted. `A second transverse opening or ex- 7o haust Z is in communication with an opening Z in the plate R, said plate carrying an exhaust-pipe Z2, leading from said opening and adapted to convey the exhaust to any deE sired point. Situated within said transverse opening F is a valve f, which is approximately T-shaped in cross-section and having rounded outer ends to snugly fit the curvature of the rounded opening F in the valveseat, and so arranged that one port at a time 8o is in communication with the supply-opening A and theother with the exhaust-opening Z. Resting upon the outer ends of the raised portion R and entirely .closing the valveseat A is a steam-chest B, which has located between the upper wall thereof and the valveseat A a second valve-seat B', which extends parallel the rst-named valve and having communication with the steam-chest through an opening Z and also communicating with 9o the valve-opening F through the opening 2. A hollow oscillating valveg is stuatedwithin said seat B, having one end in Vcommunication with the supply-pipe B2 and the other end carrying an operating-lever h, whereby the valve is oscillated. The lower face of the valve g has a longitudinally-extending opening g', adapted to register with the opening A in the valve-seat A, whereby when the valve g is oscillated the opening g' is moved so that it will not register with the opening A', thus stopping the drill.

Passing through the steam-chest, the plate R, and the plate M are bolts K, carrying on the ends thereof nuts K,-by means of which .the parts are firmly held together and alsoby means of which they can be readily attached or detached when some Worn-out piece is to be replaced by a new one.

An elongated piston-head b is situated with-I in the cylinder a and is formed of two sections, (lettered b and 52,)19 having a reduced outer end b', which carries a reduced outer screw-thread end c, which is adapted to screw with the screw-threaded aperture c of the outer portion b2 of the piston-head, whereby the combined piston-head is formed ,with a reduced central portion having spirally-arranged grooves c2, said grooves being formed with an inclined wall 3 and a vertical wall 4. The outer end of the valvefwithin the portion R. is provided with a downwardly-extending operating-arm e', extending through a longitudinally-extending opening e2 in the side of the cylinder ct and resting within the reduced portion b of the piston-head. The lower end of the arm e is approximately pawlshaped and enters from the side in the manner described and engages the ratchet-shaped spiral grooves carried bythe reduced portion, the said arm having its upper end loosely mounted upon the valvef and having a spring j3 for holding it in engagement with'the teeth. The arm enters the cylinder a between the enlarged outer ends of the piston-head, and

as the head is reciprocated the abrupt walls 5 engage the arm e and cause it to oscillate, thereby imparting an oscillating movement to the valve for admitting the motive power infirst one port and then the other, whereby the piston-head is reciprocated. The said arm e also travels in the ratchet-shaped spiral groove, whereby the piston not only has a reciprocating movement, but is rotated by the'arm e. The outer end of the piston is provided with a reduced portion 6, said portion having a transverse opening 7, which is provided with a centrally-located spring. The keys 8, -having reduced outer ends, are adaptedto tit snugly within said opening and to be supported by the spring. Surrounding the outer reduced central portion of the pistonh'ead is a gland ll,having openings 9 in its rearwardly-extending portion, which is adapted to receive the outer reduced ends of the keys 8, whereby the keys may be forced within the opening in the piston, the gland removed, Vand a new one applied for holding a cupshaped leather packing, as shown. The piston-rod c has a reduced inner end, the outer end of said reduced portion being screwthreaded at c4 and adapted to screw into the part b2 of the piston. A gland L is placed upon said reduced portion, whereby a new one may be inserted by unscrewing the piston-rod from the piston for changing the cupshaped leather packing. The other end of the piston-rod extends out through the cylinder-head and said head carries a packing m, surrounding the piston-rod to form an airtight connection. The extreme outer end ot' the piston-rod is provided-with a drill-chuck, which consists ot' an elongated shell havinga recess g' therein and a jaw p within said opening and adapted to move transverse thereof and grasp the upper face of the drill. The said shell is provided with a transversely-arranged opening intersecting the longitudinal opening and is also provided with an eccentric o, operated by a wrench o', the cam-face being adapted to engage the jaw and to rmly hold the drill. The inner face of said lever 0 is provided with a transversely-arranged spring-pressed key o2, adapted to r en terthe openings in the chuck, whereby theV eccentric is held in the desired position.

The outer cylinder-head e has a bolt X passing therethrough on the outside of-l the cylinder, while the head H is provided with an extension on each side provided witha recess X, adapted to receive a buffer w, through which the boltX passes. Buffers w are adapted to receive the bolt, and washers x tit within said recess against the packing andthe clamping -nuts X3, firmly screwed thereagainst, thereby'irmly holding the two cylinder-heads together, yet not rigidly, on account of the rubber buers w. Y

The plate M, which is supported upon the guide-shell r, has secured thereto oneither side bolts Gr, extending rearwardly and supporting the cross-head D, and swiveled therein is a feed-screw which is adapted to pass through the feed-nut S, carried by the ,plate M and extending to the end of the cylinder. The lower face of said nut is made rounded and adapted to slide on the upper face of the guide-shell d. The outer end of the feedscrew is screw-threaded and adapted to receive a split crank E, which is adapted to be locked thereon by means of the clampingbolt d. The cross-head is provided with a set-screw D', which is ,adapted to engage the feed-screw and to lock it in any desired position for the purpose of preventing the drilling from moving'the machine backward.

IOO

IIO

The operation ot' my device is as follows:

The drill having been secured in the chuck, the lever h is moved so that steam is allowed to enter the opening F, passing to the rear end of the cylinder, thereby forcingthe f stationary,while the piston is caused to rotate in the direction indicated by arrow until the arm again engages the other shoulder 5 and swings around in the opposite position. Should steam be used, packing of piston must be of metal fitted in the ordinary way. The crank E is revolved to force the cylinder forward as the drill works its way into the rock.

Having thus described myinvention, what I claim, and desire to secure by Letters Patent, is-

l. A rock-drill, comprising a cylinder, a piston therein, having a reduced central portion provided with spirally-arranged ratchetgrooves, a valve therefor` and an arm attached to the valve extending into the cylinder and engaging said grooves in the reduced portion of the piston and adapted to oscillate the valve and to rotate the piston, substantially as described.

2. A rock-drill comprising a cylinder, a piston therein having spiral grooves, a valve,and an arm connected to the valve and oscillating it and rotating the piston by the spiral grooves, substantially as described.

3. A rock-drill, comprisinga cylinder, apiston therein having spiral grooves, a valve, and an arm loosely connected to the valve and spring-retained in the grooves, whereby the valve is osoillated and the piston rotated, substantially as described.

4t. A rock-drill, comprising a cylinder, a piston therein having a reduced central portion provided with spiral grooves, an oscillating valve, an arm connected to the valve and extending through the cylinder and the reduced portion of the piston and resting in the spiral grooves, whereby the valve is oscillated and the piston rotated, substantially as described.

5. Arock-drill, comprisinga cylinder, apiston therein havinga reduced central portion provided with spiral grooves in the form of ratchet-shaped teeth, an oscillating valve, an arm loosely connected to the valve and extending through the cylinder and engaging the spiral grooves carried by the reduced portion of the piston, and a spring forcing the arm into the grooves, whereby the valve is oscillated by the arm and the piston rotated on the backward stroke, substantially as described.

G. Arock-drill, comprisinga cylinder, a piston having spiral ratchet-shaped grooves, a valve, and a spring-retained arm adapted t0 engage the ratchet-shaped grooves, and to oscillate the valve and to rotate the shaft on one stroke of the piston, substantially as described.

7. In a rock-drill, the combination with a cylinder, of a piston therein having a reduced outer end provided with a transverse recess, a spring therein, keys resting on the springs and having reduced outer ends and a packing-gland surrounding said reduced portion and having openings to receive said keys, substantially as described.

8. A rock-drill comprisinga cylinder, a piston-rod therein having a screw-threaded inner end, a piston-head adapted to receive said threaded portion of the piston and having an outer reduced portion provided with spirally-arranged ratchet-grooves, said piston having a reduced outer screw-threaded portion, a second piston-head adapted to receive the screw-threaded portion ofthe portion carrying the spiral grooves, a valve above said cylinder, and an arm carried by said valve and passing through said cylinder and en gaging the spirally-arranged grooves, substantially as described.

9. A rock-drill comprising a cylinder, a piston therein having a reduced centralportion having spiral grooves, a valve and an arm operating the valve and rotating the piston, substantiallyr as described.

l0. A rock-drill comprising a cylinder, a piston having spirally arranged elongated ratchet-shaped grooves, and a valve-arm operating the valve and rotating the piston, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing Witnesses.

GOVERNOR D. VARREN.

Witnesses:

CEAS. GEORGE, JAMES l-I. PARKS. 

